code: def try_import_cv2():
      """Try import cv2 at runtime.
  
      Returns
      -------
      cv2 module if found. Raise ImportError otherwise
  
      """
      msg = "cv2 is required, you can install by package manager, e.g. 'apt-get', \
          or `pip install opencv-python --user` (note that this is unofficial PYPI package)."
  
      return try_import("cv2", msg)
  
file_path: insightface/python-package/insightface/utils/filesystem.py
imports: import os
  import os.path
  import errno
label_desc: Use image node_id 4 for calling a global function with example usage: try_import_cv2() and returns: try_import